Refrigerator



FIG. 1 is a front elevation view of the refrigerator showing my new invention;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a front perspective view thereof; and,

FIG. 4 is a right side elevation view thereof.

The broken line in the figure drawings represents unclaimed environment only and forms no part of the claimed design. 

CLAIM The ornamental design for a refrigerator, as shown and described. 